有这样的一个业务场景。在一个数据库实例上面有差不多 80 多个数据库 DATABASE，现在有一个需求，有一个脚本文件 .sql 需要在这 80 多个数据库上都执行一遍，那么有没有什么简单的方法可以实现。
[root@localhost ~]#
[root@localhost ~]# su - postgres
[postgres@localhost ~]$ vi batch_execute_script.sh
#!/bin/bashHOST="192.168.30.140"
PORT="5432"
USER="postgres"
PASSWORD="Centos@2024"
export PGPASSWORD=${PASSWORD}
/usr/local/pgsql-12.8/bin/psql -h $HOST -p $PORT -U $USER -d postgres -c "SELECT datname FROM pg_database WHERE datname like 'cloud%';" | tail -n +3 | head -n -2 > datname.txt
for i in `cat datname.txt`
do
/usr/local/pgsql-12.8/bin/psql -h $HOST -p $PORT -U $USER -d $i -f /usr/local/src/test.sql -o i.log
done#cat datname.txt | while while read line;
#do
# echo $line
# /usr/local/pgsql-12.8/bin/psql -h $HOST -p $PORT -U $USER -d $line -f /usr/local/src/test.sql -o out.log
#done[root@localhost ~]# touch /usr/local/src/test.sql
[root@localhost ~]# chmod 755 /usr/local/src/test.sql
[root@localhost ~]# vi /usr/local/src/test.sql
CREATE TABLE "public"."mb_user" ("user_id" int8 NOT NULL,"user_name" varchar(30),"user_type" varchar(32),"telephone" varchar(30),"gender" varchar(5),"logic_state" varchar(16) DEFAULT 0,"create_time" timestamp(6),"password" varchar(255),"hospital_id" int8,"client_id" varchar(64),"birth" timestamp(6),"head_img" varchar(2000),"user_code" varchar(50),PRIMARY KEY ("user_id")
);ALTER TABLE "public"."mb_user" OWNER TO "postgres";
COMMENT ON COLUMN "public"."mb_user"."user_name" IS '用户姓名';
COMMENT ON COLUMN "public"."mb_user"."logic_state" IS '逻辑状态';
COMMENT ON COLUMN "public"."mb_user"."create_time" IS '创建时间';
COMMENT ON COLUMN "public"."mb_user"."password" IS '用户密码';
COMMENT ON COLUMN "public"."mb_user"."hospital_id" IS '默认操作医院';
COMMENT ON COLUMN "public"."mb_user"."client_id" IS '个推CID';
COMMENT ON COLUMN "public"."mb_user"."birth" IS '出生年月';
COMMENT ON COLUMN "public"."mb_user"."head_img" IS '头像';[postgres@localhost ~]$ chmod +x batch_execute_script.sh
[postgres@localhost ~]$ dos2unix batch_execute_script.sh
[postgres@localhost ~]$ sh batch_execute_script.sh在数据库实例对应的数据库下去查看脚本是否已执行
[postgres@localhost ~]$ /usr/local/pgsql-12.8/bin/psql -h localhost
postgres=# \c cloud_health
cloud_health=# \dList of relationsSchema | Name | Type | Owner
--------+---------+-------+----------public | mb_user | table | postgres
(1 row)cloud_health=#cloud_health=# \c cloud_test
cloud_test=# \dList of relationsSchema | Name | Type | Owner
--------+-------------------------------+-------------------+----------public | cloud_backup_test | table | postgrespublic | cloud_backup_test_id_seq | sequence | postgrespublic | deps_saved_ddl | table | postgrespublic | deps_saved_ddl_deps_id_seq | sequence | postgrespublic | mb_user | table | postgrespublic | partition_table | partitioned table | postgrespublic | partition_table_202201 | table | postgrespublic | partition_table_202202 | table | postgrespublic | partition_table_id_seq | sequence | postgrespublic | patient_registration | table | postgrespublic | patient_registration_20231219 | table | postgrespublic | patient_registration_20231220 | table | postgrespublic | patient_registration_id_seq | sequence | postgrespublic | user_history | table | postgrespublic | user_history_id_seq | sequence | postgrespublic | view_test | table | postgrespublic | vw_view_testa | view | postgrespublic | vw_view_testb | view | postgres
(18 rows)cloud_test=#[postgres@localhost ~]$ cat datname.txt
[postgres@localhost ~]$ cat i.log说明：在当前目录下会有这样的一个文件 datname.txt 显示了有哪些数据库执行了这个脚本文件。
